Means and method for injecting television picture tube bases

Abstract

A television cathode ray picture tube has a narrow neck terminated by a number of electrically conductive low-voltage pins and at least one high-voltage pin extending axially from the neck terminus. The tube according to the invention is characterized by having a base for passing and isolating said pins including a port adjacent to said terminus leading to a cavity surrounding the high-voltage pin. The cavity opens onto said terminus over a substantial portion of the area of the terminus. The port has acceptance means for connection to mating injector means for injecting the cavity with a metered amount of electrically insulative adhesive. The base provides for the injection of the adhesive in the exact location desired, and in an amount effective to fill the cavity and electrically isolate the high-voltage pin and adhere the base to the neck terminus. An improved method is also disclosed for electrically isolating the high-voltage pin and adhering a tube base to the neck terminus.

We claim: 
     
       1. In a television cathode ray picture tube having a narrow neck terminated by a number of electrically conductive low-voltage pins and at least one high-voltage pin extending axially from the neck terminus, said tube being characterized by having a base for passing and isolating said pins, said base including a port in the side of said base and adjacent to said terminus leading to a cavity surrounding said high-voltage pin, said cavity opening onto said terminus over a substantial portion of the area of said terminus, said port having acceptance means for connection to mating injector means for injecting said cavity with a metered amount of electrically insulative adhesive, such that said base provides for the injection of said adhesive in the exact location desired, and in an amount effective to fill said cavity and electrically isolate said high-voltage pin and adhere said base to said neck terminus. 
     
     
       2. A base for a television cathode ray picture tube having a narrow neck terminated by a number of electrically conductive low-voltage pins and at least one high-voltage pin extending axially from the neck terminus, said base providing for passing and isolating said pins and being characterized by having a port in its side adjacent to said terminus leading to a cavity surrounding said high-voltage pin, said cavity opening onto said terminus over a substantial portion of the area of said terminus, said port having acceptance means for connection to mating injector means for injecting said cavity with a metered amount of electrically insulative adhesive, such that said base provides for the injection of said adhesive in the exact location desired, and in an amount effective to fill said cavity and electrically isolate said high-voltage pin and adhere said base to said neck terminus. 
     
     
       3. For use in the manufacture of a television picture tube having a narrow neck terminated by a number of electrically conductive low-voltage pins and at least one high-voltage pin extending axially from the neck terminus, and including a base for passing and isolating said pins, said base having a cavity surrounding said high-voltage pin and opening onto said terminus, an improved method for electrically isolating said high voltage pin and adhering said base to said neck terminus, comprising: providing a base having a port in its side adjacent to said terminus and leading to said cavity;   connecting said port to mating injector means including means for aligning said port with said injector means and supporting said base against said terminus;   injecting said cavity with an electrically insulating adhesive in an amount effective to fill said cavity and contact said terminus;   such that the precise amount of said adhesive is provided in the exact location desired to electrically isolate said high voltage pin and adhere said base to said neck terminus.   
     
     
       4. For use in the manufacture of a television picture tube having a narrow neck terminated by a number of electrically conductive low-voltage pins and at least one high-voltage pin extending axially from the neck terminus, and including a base for passing and isolating said pins, said base having a cavity surrounding said high-voltage pin and opening onto said terminus, an improved method for electrically isolating said high voltage pin and adhering said base to said neck terminus, comprising: providing a base having a port in its side adjacent to said terminus;   providing said port with narrow lip means and conforming said lip means to electrically insulating adhesive injector means;   connecting said injector means to said port by aligning and mating said narrow lip means with said injector means;   extending a ledge from said injector means for supporting said base against said terminus by upward pressure exerted by an operator;   aiding in aligning and mating said narrow lip means of said port with said injector means by providing a chamfer in said ledge;   injecting said cavity with an electrically insulative thermo-setting polymer adhesive in an amount sufficient to fill said cavity and contact said terminus;   setting said polymer by exposing said base to heat;   such that the precise amount of said polymer adhesive is provided in the exact location desired to electrically isolate said high voltage pin and adhere said base to said neck terminus.   
     
     
       5. The method according to claim 4 wherein said polymer adhesive comprises a silicone potting resin. 
     
     
       6. The method according to claim 4 wherein said potting resin comprises General Electric silicone adhesive CRTV6424, known as Silastic™.